CN202770952U

CN202770952U - Partial discharge detection device of switch cabinet

Info

Publication number: CN202770952U
Application number: CN 201220266414
Authority: CN
Inventors: 陈庆祺; 刘诣; 赵俊秋; 张伟平; 谢建荣; 黄杰明; 刘勤峰; 邓建钢; 杜振波; 张鸿平; 马双
Original assignee: Wuhan NARI Ltd; Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Wuhan NARI Ltd; Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2012-06-07
Filing date: 2012-06-07
Publication date: 2013-03-06
Anticipated expiration: 2022-06-07

Abstract

The utility model relates to a partial discharge detection device of a switch cabinet. The partial discharge detection device comprises four kinds of sensors for measuring the partial discharge such as a high frequency sensor, an ultrasonic sensor, a high frequency current sensor and a TEV sensor. The data of various sensors is collected by a monitoring system, furthermore the partial discharge amount in the switch cabinet is conveniently and effectively measured, and the partial discharge position is precisely positioned, thus the data monitor reference is provided for the evaluation of the insulation performance of the switch cabinet.

Description

A kind of partial discharge of switchgear pick-up unit

Technical field

The utility model relates to the partial discharge of switchgear pick-up unit, belongs to the detection technique field.

Background technology

At present, partial discharge of switchgear detects the main non-embedded detection method for local discharge that adopts, pulse current, electromagnetic wave and the ultrasound wave that the method is mainly sent by the detection shelf depreciation realized the non-embedded detection of shelf depreciation, comprising: ultrahigh frequency method (UHF), supercritical ultrasonics technology (AE), high-frequency current method (HFCT), TEV method etc.The ultrahigh frequency method is that the electromagnetic wave that utilizes sensor to receive local discharge excited 300MHz-3GHz is monitored shelf depreciation.Supercritical ultrasonics technology is to utilize sensor to receive shelf depreciation to produce Elastic wave-acoustic emission signal monitoring shelf depreciation in the process that releases energy fast.The TEV method is to utilize sensors coupled transient voltage value to monitor the transient state voltage-to-ground that shelf depreciation produces.The high-frequency current method is at earthing cable or ground wire the high-frequency current pulse signal that High Frequency Current Sensor detects the shelf depreciation generation to be installed.Because the UHF method is comparatively responsive, can more early find for the device interior insulation degradation, the operation conditions of understanding equipment early, and AE method and HFCT method etc. can be determined the order of severity of defective preferably, can get rid of because the too responsive false-alarm that causes of UHF method, particularly the AE method can be located comparatively accurately to defective locations, and operation does not provide decision-making foundation in order not have a power failure under special circumstances.For high-tension switch cabinet, the TEV method needn't provide the Hi-pot test power supply, needn't the power failure condition under, can understand the state of the lower shelf depreciation of switch cabinet electrified operation, can find in advance potential trouble spot in the switch cubicle, changed traditional method of testing.

Chinese utility model patent " high-tension switch cabinet office puts and detects the TEV sensor " (application number: CN201120028248.0) disclosed, it is a kind of high-tension switch cabinet Partial Discharge Detection TEV sensor, formed by shell, bottom, radome, flat capacitor coupling mechanism and signal processing circuit, reduce the workload that high-tension switch cabinet is patrolled and examined, improve the reliability of testing efficient and testing result.This patent has only been announced the TEV sensor component, and does not adopt multiple sensors that electric equipment is carried out Partial Discharge Detection.Chinese utility model patent " partial discharge of switchgear detects and management system online " (application number: CN200920136831.6) disclosed, being that a kind of partial discharge of switchgear is online detects and management system, comprises sensor unit, data collector and background computer; Background computer comprises database management unit and database analysis unit, and the database analysis unit comprises that horizontal analysis, vertical analysis, statistical study and the manufacturer to data analyzes four unit; This patent can be patrolled and examined by the scene is portable, realize to detect data preserve, to functions such as data processing, analysis and computings.But this patent is not considered the difference of all kinds Characteristics of Partial Discharge, uses different sensors to detect dissimilar discharge.Adopt multiple sensors that the electric equipment shelf depreciation is carried out multi-channel synchronous and detect, can learn from other's strong points to offset one's weaknesses in measuring method, the on-the-spot various interference that run into are got rid of in mutually confirmation preferably.Therefore, complementing each other as equipment state overhauling provides reliable technical data between the distinct methods, the work efficiency of raising maintenance of electric device.

The utility model content

The purpose of this utility model is, overcomes the deficiencies in the prior art, the method and the device that provide a kind of partial discharge of switchgear to detect, and partial discharge quantity that can convenient, effective measuring switch cabinet inside is also accurately located partial discharge position.

The technical solution of the utility model is: a kind of partial discharge of switchgear pick-up unit, comprise industrial pocket computer, capture card, signal condition unit and sensor, capture card is by signal condition unit pick-up transducers data, the industry pocket computer reads the capture card signal, it is characterized in that: described sensor comprises UHF sensor, AE sensor, HFCT sensor, TEV sensor, described HFCT sensor places switch cabinet bus side joint ground wire, the UHF sensor places on the front window or rear window of switch cubicle, and described AE sensor and TEV sensor are removable.Its beneficial effect is: can carry out many group Partial Discharge Detection to same switch cubicle at diverse location simultaneously by a plurality of different partial discharge detecting sensor baseds.

Description of drawings

Below in conjunction with accompanying drawing the utility model is described in further detail.

Fig. 1 is principle schematic of the present utility model;

Fig. 2 is the utility model in-site measurement schematic diagram.

Embodiment

Reference numeral: 1 is that UHF sensor, 2 and 2 ' is the window of switch cubicle for TEV sensor, 4 for HFCT sensor, 5 for AE sensor, 3 and 3 '.

Uhf sensor described herein is the UHF sensor, and ultrasonic sensor is the AE sensor, and High Frequency Current Sensor is the HFCT sensor.

Below in conjunction with accompanying drawing, the utility model is described further.

Shown in 1, a kind of partial discharge of switchgear pick-up unit comprises industrial pocket computer, capture card, signal condition unit and sensor, and capture card is by signal condition unit pick-up transducers data, and industrial pocket computer reads the capture card signal.Sensor comprises UHF sensor, AE sensor, HFCT sensor, TEV sensor, and AE sensor and TEV sensor can according to testing requirement, move to different test positions.The UHF sensor places on the window of switch cubicle front-back, and the HFCT sensor places switch cabinet bus side joint ground wire.Can carry out many group Partial Discharge Detection to same switch cubicle at diverse location simultaneously by a plurality of different partial discharge detecting sensor baseds.

The utility model is as theoretical foundation take detection method for local discharge, comprise ultrahigh frequency method, supercritical ultrasonics technology, TEV method and high-frequency current method, adopt a plurality of different partial discharge detecting sensor baseds simultaneously same switch cubicle to be carried out Partial Discharge Detection at diverse location.Concrete steps are as follows:

1) at the switch cubicle outside surface two check points is set, AE sensor and TEV sensor are installed respectively, the UHF sensor is placed the switch cubicle front window, the HFCT sensor is placed switch cabinet bus side joint ground wire.As shown in Figure 2, at 1 place the UHF sensor is installed, the AE sensor is installed at 2 places, the TEV sensor is installed at 3 places, the HFCT sensor is installed at 4 places.Why polytype sensor is installed, and is because shelf depreciation mainly releases energy with the form of electromagnetic wave and sound wave, has a plurality of detecting sensors can improve the accuracy whether detection has shelf depreciation.For example, the UHF sensor can detect the electromagnetic wave of 300M-3GHZ, the AE sensor can detect the ultrasound wave that partial discharge of switchgear produces, the TEV sensor has judged whether shelf depreciation by measuring the transient state voltage-to-ground, and the HFCT sensor can be judged by the bus bar side earth terminal orientation of shelf depreciation.Because these four sensors are in same environment, the Partial Discharge Data of same switch cubicle is carried out multichannel synchronousing collection, measurement result has across comparison.

2) start-up system software gathers the signal of each sensor feedback; Whether the parameters such as intensity, amplitude and phasing degree of comprehensive comparison feedback signal are to existing shelf depreciation to judge.Because it is larger that switch cubicle is disturbed at the scene, carry out duplicate measurements at a plurality of points and can eliminate interference, improve the accuracy of judged result.For example, the AE sensor being moved to 2 ' locates; The TEV sensor is moved to 3 ' to be located; The UHF sensor is moved to switch cubicle rear hatch place; Because switch cabinet bus side joint ground wire only has a place, so the position of HFCT sensor can remain unchanged.Repeatedly removable probe sensor detects the switch cubicle diverse location, obtain shelf depreciation value and phase data that many these four kinds of methods of group detect, the shelf depreciation value of phase place at first and third quadrant compared, if have two groups and above larger local place value, can judge that there is shelf depreciation in this switch cubicle.

3) to there being the switch cubicle of shelf depreciation, by ultrasonic locatization and TEV method partial discharge position is positioned.Because the AE method can be located comparatively accurately to defective locations, operation does not provide decision-making foundation in order not have a power failure under special circumstances; For high-tension switch cabinet, the TEV method needn't provide the Hi-pot test power supply, needn't the power failure condition under, can understand the state of the lower shelf depreciation of switch cabinet electrified operation, find in advance potential trouble spot in the switch cubicle.

Fig. 2 is the utility model in-site measurement schematic diagram, four kinds of sensor integrated monitor devices for the partial discharge of switchgear monitoring of the present utility model are comprised of four partial discharge detecting sensor baseds, the signal that collects transfers to main control unit by signal conditioning circuit, data acquisition card, main control unit carries out multichannel synchronousing collection to four road unlike signals, in conjunction with existing shelf depreciation decision method, the state of insulation of switch cubicle is qualitatively judged.

In the actual measurement process, because the switch cubicle in the master-control room is close-packed arrays one by one, therefore sensor generally can only place the front and back of switch cubicle, and two sides generally can not placement sensor, and the UHF sensor generally is arranged on the window of switch cubicle front-back.

Claims

1. partial discharge of switchgear pick-up unit, comprise industrial pocket computer, capture card, signal condition unit and sensor, capture card is by signal condition unit pick-up transducers data, the industry pocket computer reads the capture card signal, it is characterized in that: described sensor comprises UHF sensor, AE sensor, HFCT sensor, TEV sensor, described HFCT sensor places switch cabinet bus side joint ground wire, the UHF sensor places on the front window or rear window of switch cubicle, and described AE sensor and TEV sensor are removable.